JP3161105U - Piping connection structure - Google Patents

Abstract

Provided is a pipe connection structure that can save installation man-hours with a simple configuration and that does not require a large space for installation. In a pipe connection structure in which a pipe 2 formed by being inserted into a pipe insertion hole 3 of the casing 1 is attached to a casing 1 having a pipe insertion hole 3, the outer periphery of the pipe 2 and the inner circumference of the pipe insertion hole 3 The ring-shaped sealing member O-ring 4 that seals the fluid and the inner peripheral side is engaged with the ring mounting groove 2a provided on the outer periphery of the pipe 2, and the outer peripheral side of the casing 1 is A retaining ring 5 that is engaged with a ring mounting recess 3b that is a retaining ring mounting portion provided on the outer surface, and a retaining ring 5 that is fixed to the outside of the retaining ring 5 that is engaged with the ring mounting recess 3b. 5 and a fixing member 6 that restricts movement in the axial direction. [Selection] Figure 3

Description

  The present invention relates to a pipe connection structure provided at a location where a pipe is connected to a housing.

  Conventionally, as shown in FIGS. 4 and 5, a female screw hole a <b> 1 is formed in the housing a at a location where the pipe is connected to the housing, and one end portion of the fitting joint b or elbow c is formed in the female screw hole a <b> 1. The male threaded parts b1 and c1 formed in the above are screwed together to attach the fitting joint b or elbow c to the housing a, and the other end of the fitting joint b or elbow c has a flare-processed pipe d in advance. The end d1 of the pipe d which has been subjected to flare processing by bringing the end d1 into surface contact and screwing the fitting nut e into the male screw parts b2 and c2 formed at the other end of the fitting joint b or the elbow c. The structure which connects the piping d and the housing | casing a by crimping | bonding to the fitting joint b or the elbow c via the sleeve f is employ | adopted widely (for example, refer patent document 1). Any fitting joint or elbow used in such a configuration is prescribed in public standards and is preferable from the viewpoint of procurement.

  However, any of the fitting joints or elbows specified in the public standards can be used in a very high pressure hydraulic system. When such a fitting joint or elbow uses only a relatively low-pressure fluid such as an air system, the strength is excessive and the following problems may occur.

  Specifically, in the conventional configuration, it is necessary to prepare at least fitting joints and nuts, and in addition to the increase in the number of parts, it is necessary to perform flare processing on the piping, so that the man-hour for connection also increases. Can happen.

  In addition, the size and mass of the fitting joint is large, the fitting joint protrudes from the mounting surface of the housing, and a certain length is required to flare the piping. There is also a possibility that it is necessary to secure a space for installing the fitting joint.

  In addition, since the piping and fitting fitting are in surface contact, the piping must be installed in order to prevent the air piping from being attached due to the accumulated tolerance of the length between the mounting surfaces and the length of the piping. It is necessary to provide a bent shape or the like that absorbs the accumulated tolerance, and in this respect as well, there may be a problem that a large space is required for installation.

JP 2010-38260 A

  Based on the above, the present invention is intended to realize a pipe connection structure with a simple configuration that can save installation man-hours and does not require a large space for installation.

  That is, one of the pipe connection structures according to the present invention includes a casing having a pipe insertion hole, a pipe inserted through the pipe insertion hole of the casing, an outer periphery of the pipe, and an inner periphery of the pipe insertion hole. The ring-shaped seal member that seals the fluid located between the ring and the ring mounting groove provided on the outer periphery of the pipe on the inner peripheral side and the retaining ring mounting portion provided on the casing on the outer peripheral side It uses a retaining ring that is engaged, and a fixing member that is fixed to the outside of the retaining ring that is engaged with the ring mounting portion and restricts the axial movement of the retaining ring. Piping connection structure.

  Further, another one of the pipe connection structures according to the present invention includes a casing having a pipe insertion hole, a pipe inserted through the pipe insertion hole of the casing, an outer periphery of the pipe, and the pipe insertion hole. A ring-shaped seal member that is located between the inner periphery and seals the fluid, and a retaining ring that is engaged with a ring mounting portion provided on the outer periphery of the pipe on the inner periphery and provided on the casing on the outer periphery. A retaining ring that is press-fitted into the mounting portion is used.

  According to such a configuration, the retaining ring is mounted in the ring mounting groove on the outer periphery of the pipe, and the retaining member is mounted on the retaining ring mounting portion provided in the housing, and the fixing member is attached or detached. The axial movement of the retaining ring is restricted by press-fitting the retaining ring into the retaining ring mounting portion of the housing. In addition, since the retaining ring is mounted in the ring mounting groove on the outer periphery of the pipe, the relative movement between the pipe and the retaining ring is also restricted. Therefore, there is no need to prepare special members such as fitting joints, sleeves, and nuts, and the piping moves relative to the housing with a small number of parts and man-hours and without requiring a large installation space. It can be prevented from coming off.

  As an example of a preferable configuration of the retaining ring, there is a structure in which the retaining ring is combined with a pair of ring elements each having a semicircular arc shape. If it is such, attachment work to piping of a retaining ring can be performed easily.

  As another example of a preferable configuration of the retaining ring, one in which the retaining ring has an annular shape can be cited. With such a configuration, the number of parts can be further reduced.

  And as a suitable usage aspect of such a pipe connection structure, what the said pipe is a pipe | tube which distribute | circulates gas is mentioned.

  According to the configuration of the present invention, it is possible to save the installation man-hours with a simple configuration and to realize a pipe connection structure that does not require a large space for installation.

The front view which shows the piping connection structure which concerns on one Embodiment of this invention. Xx sectional drawing in FIG. The disassembled perspective view which shows the piping connection structure which concerns on the same embodiment. The longitudinal cross-sectional view which shows the conventional piping connection structure. The longitudinal cross-sectional view which shows the conventional piping connection structure.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  The pipe connection structure according to the present embodiment is used, for example, at a site where a pipe 2 for introducing air into the casing 1 of a pneumatic valve is attached.

  Specifically, as shown in FIGS. 2 and 3, the housing 1 is provided with a pipe insertion hole 3 for inserting the tip of the pipe 2. An O-ring groove 3a for fitting an O-ring 4 as a seal member is provided in the pipe insertion hole 3. Further, the opening end edge of the pipe insertion hole 3 is provided with a retaining ring mounting recess 3b that is a retaining ring mounting part that can engage with the retaining ring 5. Here, in FIG. 3, the housing 1 is shown with a part thereof broken.

  On the other hand, as shown in FIGS. 2 and 3, the pipe 2 is provided with a retaining ring mounting groove 2 a in a portion near the tip thereof. The retaining ring 5 can be mounted on the retaining ring mounting groove 2a from the outside. The groove width of the retaining ring mounting groove 2 a is set larger than the thickness dimension of the retaining ring 5. Further, between the outer periphery of the pipe 2 and the inner periphery of the pipe insertion hole 3, more specifically, between the outer periphery on the tip side of the retaining ring mounting groove 2a and the O-ring groove 3a in the pipe insertion hole 3. In addition, an O-ring 4 is arranged to seal the fluid.

  As shown in FIG. 3, the retaining ring 5 is formed by combining a pair of ring elements 5a each having a semicircular arc shape. The retaining ring 5 is engaged with the retaining ring mounting groove 2 a provided on the outer periphery of the pipe 2 on the inner peripheral side, and is engaged with the retaining ring mounting recess 3 b provided on the outer surface of the housing 1 on the outer peripheral side. Thus, the piping 2 is positioned with respect to the housing 1.

  As shown in FIGS. 1 and 3, a pipe passage hole 6a for allowing the pipe 2 to pass therethrough and a male screw member 7 are provided on the outside of the retaining ring 5 engaged with the retaining ring mounting recess 3b. A plate-like fixing member 6 having a screw insertion hole 6b for passing through is attached. In a state where the male screw member 7 passed through the screw insertion hole 6b is screwed into the female screw hole 8 provided in the housing 1 and the fixing member 6 is fixed to the housing 1, the fixing member 6 is The movement of the retaining ring 5 in the axial direction is restricted. In FIG. 3, the fixing member 6 is shown with a part thereof broken.

  Here, when the pipe 2 is subjected to an action in the direction of being removed from the housing 1, the end edge of the retaining ring mounting groove 2 a of the pipe 2 hits the retaining ring 5 and comes off. While the retaining ring 5 is pressed in the direction in which it is removed from the housing 1, the retaining ring 5 is restricted from moving in the direction in which it is removed by the fixing member 6. Removal is also regulated.

  As described above, according to the pipe connection structure of the present embodiment, the retaining ring 5 is engaged with the retaining ring mounting groove 2 a provided on the outer periphery of the pipe 2, and the retaining ring 5 is attached to the housing 1. Since the fixing member 6 is attached to the retaining ring mounting recess 3b provided at the opening edge of the pipe insertion hole 3, the relative movement between the housing 1 and the retaining ring 5 is restricted. In addition, relative movement between the pipe 2 and the retaining ring 5 is also restricted. Therefore, it is not necessary to prepare special members such as fitting joints, sleeves and nuts, and the pipe 2 moves relative to the housing 1 with a small number of parts and man-hours and without requiring a large installation space. It is possible to prevent the body 1 from coming off. In addition, air leakage is prevented by providing an O-ring 4 between the inner periphery of the pipe insertion hole 3 and the outer periphery of the pipe 2 on the downstream side of the retaining ring 5. Since the function of performing the above-described sealing and the function of preventing the pipe 2 from being detached are carried by separate portions, the structure can be simplified in this respect as well.

  Furthermore, since the retaining ring 5 is formed by combining a pair of ring elements 5a each having a semicircular arc shape, the attaching operation of the retaining ring 5 to the pipe 2 can be easily performed.

  The present invention is not limited to the embodiment described above.

  For example, the fixing member may be omitted by making the outer diameter of the retaining ring smaller than the diameter of the retaining ring mounting groove and pressing the retaining ring into the retaining ring mounting groove. With such a configuration, it is possible to suitably reduce the number of parts and the number of assembling steps particularly in a usage mode in which the piping is not frequently attached and detached.

  Furthermore, the retaining ring is not limited to a combination of a pair of ring elements having a semicircular arc shape, but is a combination of three or more ring elements each having a shape obtained by dividing the arc shape into three or more. It may be.

  Further, the retaining ring may be one using a single annular member formed of an elastically deformable material, a C ring, an E ring, or the like. In this case, since the retaining ring is composed of only one member, the number of parts can be reduced.

  And the pipe connection structure of the present invention is adopted not only for pipes that allow air to pass through but also to pipes that allow other gases to pass through and pipes that allow low-pressure liquid to pass through. Also good.

  In addition, various modifications may be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Housing 2 ... Piping 3 ... Piping insertion hole 3b ... Retaining ring mounting part 4 ... O-ring (seal member)
5 ... Retaining ring 5a ... Ring element 6 ... Fixing member

Claims (5)

A casing having a pipe insertion hole, a pipe inserted into the pipe insertion hole of the casing, and a ring-shaped seal positioned between the outer periphery of the pipe and the inner periphery of the pipe insertion hole. A seal member, a retaining ring having an inner peripheral side engaged with a ring mounting groove provided on the outer periphery of the pipe, and an outer peripheral side engaged with a retaining ring mounting portion provided on the housing; and the ring mounting portion A pipe connection structure characterized by using a fixing member fixed to the outside of the retaining ring in a state engaged with the retaining ring and restricting movement of the retaining ring in the axial direction. A casing having a pipe insertion hole, a pipe inserted into the pipe insertion hole of the casing, and a ring-shaped seal positioned between the outer periphery of the pipe and the inner periphery of the pipe insertion hole. A seal member and a retaining ring that is engaged with a ring mounting portion provided on the outer periphery of the pipe on the inner peripheral side and press-fitted into a retaining ring mounting portion provided on the casing on the outer peripheral side are used. Piping connection structure. The pipe connection structure according to claim 1 or 2, wherein the retaining ring is a combination of a pair of ring elements each having a semicircular arc shape. The pipe connection structure according to claim 1 or 2, wherein the retaining ring has an annular shape. The pipe connection structure according to claim 1, wherein the pipe is a pipe through which a gas flows.

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